SQL & PL/SQL :: Pick Up 3% Of Records Per Day?

create table test1(x number, y date)

insert into test1 VALUES (1, '01-OCT-2010');
insert into test1 VALUES (1, '01-OCT-2010');
insert into test1 VALUES (1, '01-OCT-2010');
insert into test1 VALUES (1, '01-OCT-2010');
insert into test1 VALUES (1, '01-OCT-2010');
insert into test1 VALUES (1, '01-OCT-2010');
insert into test1 VALUES (1, '01-OCT-2010');

[code]....

I need an sql which would pick 3% of the records per day

select count(*), y from test1
group by y
21 10/1/2010
14 10/2/2010
6 10/3/2010

So I need 3% of 21 (.63) randomely picked up for 10/1.

similarly 3% of total number of rows from 10/2, 10/3 to be picked up.